Gday Rick,
good to see the progress.
Just for interest- the tool you bought, do you actually mean a cordless
hammer/drill driver (ie, with a keyless chuck, hammer and non-hammer settings, and likely a clutch)
, or the one I was talking about being a
impact driver (minimal settings if any)
? Both quite different tools and actions...
Of course if it is working for you, then it does not really matter- so that is where the 'just for interest' part comes in

If you are using an impact driver, then I can fully picture how it would be working... basically the tool tries to spin the bit in the direction you want it to, and then once it reaches a certain level of torque begins to 'impact' the bit counterclockwise a few times a second...
If you are using a hammer/drill driver, with the hammer setting as you seem to describe, then it gets a little more interesting... it would be hammering down through the screw as it is also turning it counterclockwise. I would assume that you would also be using the clutch when doing this- which when properly tuned to the job at hand doesn't work all that differently to a impact driver... Interesting solution if that is the case,
anyway,
thanks for the update,
Hans.